People in the fitness
profession are obsessed with numbers. We
track body weight, body fat percentage, BMI (even though we all know it’s not a
good indicator), waist size, reps completed, single rep max for a variety of
exercises, and the like. This is not a bad
thing because numbers make some kinds of progress easy to track.
Numbers rarely tell the
whole story, though. There is no
numerical representation for how tired we feel, or how sore, or, conversely,
how much more energy we have or how empowered we feel.
I am not even slightly
suggesting that we throw out the numbers.
I just want to add some words as well:
perceived exertion.
Perceived exertion is on
my mind because I was sick last week. I
knew I was the kind of sick that needed to go back to bed while I was doing my
usual morning stint on the spin bike and it was perceptibly harder than usual. It wasn’t that my heart rate was unusually high
or that I had more pain than any other day—it was a feeling that I was pushing
against something more than the resistance of the bike. I stopped the workout, canceled my clients,
and slept so I could get better faster.
Even when we aren’t sick,
we need to keep perceived exertion in mind.
It helps us calibrate. If we are
mindful of how hard we are working, we know when to make things a little more
challenging and when to back off a bit, even if the shift is not big enough to
show in the numbers.
We are not letting
ourselves off the hook when we recognize that any particular day might be a
good one to take the shorter run/bike/swim or choose the smaller weights. We are not being overconfident when we
realize that we really have enough in us to tackle the hill route or increase
the starting weight. We know because we
are paying attention, and there isn’t a number for that.